Apps similar to Penrose include draw.io, which is free and open source. Other options are LibreOffice - Draw, yEd Graph Editor, Microsoft Visio and PlantUML. Diagram Editors like Penrose are a crowded field, with more than 50 alternatives for Windows, Mac, the web, Linux and self-hosting.
The PlantText tool is an online tool for quickly creating UML (Unified Modeling Language) diagrams. Unlike most tools, PlantText can build diagrams without the use of a mouse because it is based on PlantUML markup language.
Lets you easily draw a diagram - mind map, concept map, or flow chart - and convert it to a text outline, and vice versa.
Xfig is an interactive drawing tool which runs under X Window System Version 11 Release 4 (X11R4) or later, on most UNIX-compatible platforms, and e.g. under Darwin on the MacIntosh and any X server under Microsoft Windows.
Theory Maker is a free web app by Steve Powell for making any kind of causal diagram, i.e. a diagram which uses arrows to say what contributes to what. You make the diagrams just by typing the names of the elements (called variables) in a structured way into a (resizeable)...
Social Network Visualizer (SocNetV) is a cross-platform, user-friendly application for the analysis and visualization of Social Networks in the form of mathematical graphs, where vertices depict actors/agents and edges represent their relations.
Greece
EU
Diagrams is a powerful, flexible, declarative domain-specific language for creating vector graphics, using the Haskell programming language.
blockdiag and its family generate diagram images from simply text file.
Features:
Supports many types of diagrams block diagram (w/ blockdiag) sequence diagram (w/ seqdiag) activity diagram (w/ actdiag) logical network diagra.
Japan
Russia
Asymptote is a powerful descriptive vector graphics language that provides a natural coordinate-based framework for technical drawing. Labels and equations are typeset with LaTeX, for high-quality PostScript output.
KeyLines is a JavaScript toolkit used by developers to build powerful network visualization applications, quickly.
United Kingdom
